6.84 gm Al3(SO4)3 is needed to coagulate 2.5 L of As2S3 sol completely in 2.0 hrs. The coagulation value of Al2(SO4)3 is :

6.84 gm Al3(SO4)3 is needed to coagulate 2.5 L of As2S3 sol completely in 2.0 hrs. The coagulation value of Al2(SO4)3 is :

  1. A
  2. B
  3. C
  4. D

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    Solution:

    2.5 L is coagulated by=20 mm

    1 L is coagulated by=202.5=8

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